Analysis of thermal demagnetization behavior of Nd–Fe–B sintered magnets using magnetic domain observation | Zendy

M. Takezawa | Zendy; Soichiro Ikeda | Zendy; Yuji Morimoto | Zendy; Hisayuki Kabashima | Zendy

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Analysis of thermal demagnetization behavior of Nd–Fe–B sintered magnets using magnetic domain observation

Author(s) -

M. Takezawa,

Soichiro Ikeda,

Yuji Morimoto,

Hisayuki Kabashima

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4944402

Subject(s) - demagnetizing field , coercivity , magnet , materials science , dysprosium , condensed matter physics , magnetic domain , magnetization , thermal stability , single domain , grain boundary , nuclear magnetic resonance , metallurgy , magnetic field , microstructure , chemistry , physics , inorganic chemistry , organic chemistry , quantum mechanics

We used magnetic domain observation to statistically observe the thermal demagnetization behavior of Nd–Fe–B sinteredmagnets at elevated temperatures up to 150 °C. Simultaneous magnetization reversal in a hundred adjacent grains occurred at 90 °C because of the magnetic interaction among the grains beyond grain boundaries in the Dysprosium (Dy)-free low-coercivity magnet. Conversely, simultaneous magnetization reversal in a hundred grains did not occur in the Dy-added high-coercivity magnets, and the demagnetizing ratio steadily increased with temperature. Furthermore, the addition of Dy induced high thermal stability by eliminating the simultaneous thermal demagnetization, which was caused by the magnetic interaction among the grains

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